Define "hazardous materials".

The definition of "hazardous materials" encompasses any substances that have the potential to cause harm to health, safety, or the environment. This broad classification includes a variety of materials, including toxic chemicals, radioactive substances, flammable liquids, explosives, and many others that, under certain conditions, can lead to adverse effects. By focusing on their potential risk, this definition emphasizes the importance of proper handling, storage, and emergency response protocols that are vital in preventing accidents and safeguarding both individuals and the environment.

In contrast, the other choices narrow the definition improperly. Limiting hazardous materials to only flammable substances ignores the wide range of other risks posed by different types of materials. Describing hazardous materials as those solely involved in construction does not capture the diversity of hazardous substances found across various industries. Referring to non-perishable items in storage as hazardous materials is misleading because such items do not inherently pose a risk unless they meet specific threat criteria. Thus, the accurate and comprehensive definition is reflected in the correct choice.